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Chapter 27 



110 



more airspace in the stack. Cords in which a greater percentage of the sticks were 

 round also had greater wood volumes than cords with a high percentage of split 

 sticks (fig. 27-2). 



120 



I 



I 



100 - 



90 - 



80 



50 



60 70 80 90 100 



NUMBER OF STICKS PER CORD 



10 



120 



Figure 27-2. — Number of sticks per cord and percentage of the sticks that are round (the 

 balance being split) related to the volume of wood, free of bark and voids, in a 160- 

 cu-ft stacked cord of peeled, 5-foot-long sticks of mixed oak (Drawing after Barrett et 

 al. 1941.) 



In general, cords of short bolts contain more solid material than cords of long 

 bolts (table 27-1), probably because the longer the bolt the greater the effect of 

 crook or taper can be. 



Number of pieces per cord. — The number of pieces in a standard rough cord 

 is obviously a function of bolt diameter and length, irregularities in the bolts, and 

 compactness of the pile. 



For pulpwood of better than average straightness and surface smoothness, 

 table 27-5 shows the number of rough bolts required to make a standard cord, as 

 a function of both bolt length and midlength dib; e.g., 152 4-foot-long, 5-inch 

 bolts are required, whereas only twenty 6-foot-long, 12-inch bolts are needed. 



Veneer cores approach the ultimate in straightness and surface smoothness; 

 the number of 4-fo6t veneer cores required to make a cord is of interest because 

 this number should represent the upper limit for extremely straight and smooth, 

 bark-free pulpwood (table 27-6). 



Number of trees required per cord. — The number of hardwoods required to 

 yield a standard rough cord depends on tree diameter, height, and form. Table 



